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  • Non-perturbative flow equations from continuous unitary transformations 
    Kriel, J. N.   Morozov, A. Y.   Scholtz, F. G. (Institute of Physics Publishing (IOP), 2005-01)
    We use a novel parametrization of the flowing Hamiltonian to show that the flow equations based on continuous unitary transformations, as proposed by Wegner, can be implemented through a nonlinear partial differential ...
  • Non-perturbative flow equations from continuous unitary transformations 
    Kriel, Johannes Nicolaas (Stellenbosch : University of Stellenbosch, 2005-12)
    The goal of this thesis is the development and implementation of a non-perturbative solution method for Wegner’s flow equations. We show that a parameterization of the flowing Hamiltonian in terms of a scalar function ...